condition mean min max ZT0-3 13.85505 12.74405 14.43075 ZT4-7 10.013349999999999 10.013349999999999 10.013349999999999 ZT8-11 10.9204 10.9204 10.9204 ZT12-15 16.415525000000002 15.607299999999999 17.223750000000003 ZT16-19 16.69945 16.69945 16.69945 ZT20-23 15.791350000000001 15.791350000000001 15.791350000000001